The Language Teacher Yet another excellent journal from Japan. Published by the Japanese Association for Language Teaching, this is more academic/theoretical than ITESLJ.
ESL Magazine US publication that puts just one tantalising article online from each quarterly issue.
English To Go A growing bank of ESL lessons based on Reuters newspaper articles. One free lesson every week, but for access to the archives you must pay a subscription.
One Stop English An excellent collection of resources from macmillan English.
SelfAccess.com A superb site, run by Reuters, with IELTS-style vocabulary and reading comprehension tasks. Tick boxes and gaps for text, a clock to keep you on your toes, feedback on your current score... and a wide range of topics, updated weekly (unfortunately, to access their Library of earlier lessons you must be a fee-paying member of English-to-Go).
SCORE Cyberguides Schools of California Online Resources for Education (SCORE): truly excellent yet free literature guides to rival the likes of Cliff's Notes and Cole's Notes.
Outta Ray's Head A large collection of lesson plans, handouts and ideas: very good on writing and literature.
Online Writing Lab Excellent writing resources from Purdue University, USA
"Hot Potatoes" Software Impressive, downloadable software from the University of Victoria, Canada that allows you to create your own cloze exercises, word puzzles etc.
The New Internationalist This takes you to the N.I.'s superb index of back issues. Many of the articles are unsuitable for ESOL learners, but there are very good "Facts at a Glance" pages, lots of human interest stories, opportunities to write protest letters and links to relevant websites. NI: Global Issues for Learners of English has simplified some NI articles and added learning tasks.
The Times Educational Supplement (TES) A weekly UK publication aimed mainly at British state school teachers. However, there are occasional features of interest to TESOL people and a comprehensive Jobs sections that includes international schools.
BBC Education A vast site containing links to cross-curricular resources, TV/radio programmes, audio files and other educational sites.
Guardian Unlimited Online version of "The Guardian", my favourite UK newspaper, with very useful archives and a "text only" facility.
Roald Dahl Fans A simply but elegantly presented site run by the devoted Kristine Howard. The best one-stop site for Dahl resources (and I'm not just saying that because you can find my work there!).